Solution‐Processable n‐Type Semiconductors Based on Unsymmetrical Naphthalene Imides: Synthesis,Characterization, and Applications in Field‐Effect Transistors |
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Authors: | Jinjun Shao Jingjing Chang Prof Chunyan Chi |
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Institution: | Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 (Singapore), Fax: (+65)?6779‐1691 |
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Abstract: | A series of unsymmetrical naphthalene imide derivatives ( 1a , 1b , 2 , 3 , 4 , 5 ) with high electron affinity was synthesized and used in n‐channel organic field‐effect transistors (OFETs). They have very good solubility in common organic solvents and good thermal stability up to 320 °C. Their photophysical, electrochemical, and thermal properties were investigated in detail. They showed low‐lying LUMO energy levels from ?3.90 to ?4.15 eV owing to a strong electron‐withdrawing character. Solution‐processed thin‐film OFETs based on 1a , 1b , 2 , 3 , 4 were measured in both N2 and air. They all showed n‐type FET behavior. The liquid‐crystalline compounds 1a , 1b , and 3 showed good performance owing to the self‐healing properties of the film in the liquid‐crystal phase. Compound 3 has an electron mobility of up to 0.016 cm2 V?1 s?1 and current on/off ratios of 104–105. |
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Keywords: | electrochemistry naphthalene imides photophysics semiconductors thin films |
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